Mathematics, 01.10.2019 05:30 jazz589729

Cos(2pi/28)cosec(3pi/28)+cos(6pi/28 )cosec(9pi/28)+cos(18pi/28)cosec(27 pi/28)=0

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Cos(2pi/28)cosec(3pi/28)+cos(6pi/28 )cosec(9pi/28)+cos(18pi/28)cosec(27 pi/28)=0...

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